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MgO-attached graphene nanosheet(MgO@GNS)reinforced magnesium matrix nanocomposite with superior mechanical,corrosion and biological performance

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2062-2076页

作者： S.Abazari A.Shamsipur h.r.bakhsheshi-rad M.S.Soheilirad F.Khorashadizade S.S.Mirhosseini Department of Materials and Metallurgical Engineering Amirkabir University of TechnologyTehran ***Iran Iranian National Standards Organization of hormozgan HormozganIran Advanced Materials research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Materials and Metallurgical Engineering Iran University of Science and TechnologyTehranIran

Magnesium(Mg)alloys are gaining great consideration as body implant materials due to their high biodegradability and ***,they suffer from low corrosion resistance and antibacterial *** this research,semi-powder metallurgy followed by hot extrusion was utilized to produce the magnesium oxide@graphene nanosheets/magnesium(MgO@GNS/Mg)composite to improve mechanical,corrosion and cytocompatibility *** have revealed that the incorporation of MgO@GNS nanohybrids into Mg-based composite enhanced microhardness and compressive *** vitro,osteoblast cell culture tests show that using MgO@GNS nanohybrid fillers enhances osteoblast adhesion and apatite *** presence of MgO@GNS nanoparticles in the composites decreased the opening defects,micro-cracks and micro-pores of the composites thus preventing the penetration of the corrosive solution into the *** demonstrated that the MgO@GNS/Mg composite possesses excellent antibacterial properties because of the combination of the release of MgO and physical damage to bacterium membranes caused by the sharp edges of graphene nanosheets that can effectively damage the cell wall thereby facilitating penetration into the bacterial lipid ***,the MgO@GNS/Mg composite with high mechanical strength,antibacterial activity and corrosion resistance is considered to be a promising material for load-bearing implant applications.

关键词： metal matrix composites MgO@GNS nanohybrid strengthening mechanisms antibacterial activity biocompatibility

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Magnesium-based nanocomposites:A review from mechanical,creep and fatigue properties

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Journal of Magnesium and Alloys 2023年第8期11卷 2655-2687页

作者： S.Abazari A.Shamsipur h.r.bakhsheshi-rad J.W.Drelich J.Goldman S.Sharif A.F.Ismail M.razzaghi Department of Materials and Metallurgical Engineering Amirkabir University of TechnologyTehranIran Advanced Materials research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Materials Science and Engineering Michigan Technological UniversityHoughtonMI 49931USA Department of Biomedical Engineering Michigan Technological UniversityHoughtonMI 49931USA Advanced Manufacturing research Group Faculty of Mechanical EngineeringUniversiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Advanced Membrane Technology research Center(AMTEC) Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia

The addition of nanoscale additions to magnesium(Mg)based alloys can boost mechanical characteristics without noticeably decreasing *** Mg is the lightest structural material,the Mg-based nanocomposites(NCs)with improved mechanical properties are appealing materials for lightweight structural *** contrast to conventional Mg-based composites,the incorporation of nano-sized reinforcing particles noticeably boosts the strength of Mg-based nanocomposites without significantly reducing the *** present article reviews Mg-based metal matrix nanocomposites(MMNCs)with metallic and ceramic additions,fabricated via both solid-based(sintering and powder metallurgy)and liquid-based(disintegrated melt deposition)*** also reviews strengthening models and mechanisms that have been proposed to explain the improved mechanical characteristics of Mg-based alloys and ***,synergistic strengthening mecha-nisms in Mg matrix nanocomposites and the dominant equations for quantitatively predicting mechanical properties are ***,this study offers an overview of the creep and fatigue behavior of Mg-based alloys and nanocomposites using both traditional(uniaxial)and depth-sensing indentation *** potential applications of magnesium-based alloys and nanocomposites are also surveyed.

关键词： Magnesium-based nanocomposites Nanoreinforcement Strengthening mechanisms Creep properties Fatigue properties

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Thermal Characteristics,Mechanical Properties,In Vitro Degradation and Cytotoxicity of Novel Biodegradable Zn-Al-Mg and Zn-Al-Mg-xBi Alloys

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Acta Metallurgica Sinica(English Letters) 2017年第3期30卷 201-211页

作者： h.r.bakhsheshi-rad E.hamzah h.T.Low M.h.Cho M.Kasiri-Asgarani S.Farahany A.Mostafas M.Medraj Advanced Materials research Center Department of Materials Engineering Najafabad Branch Islamic Azad University Najafabad Iran Department of Materials Manufacturing and Industrial Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia research and Development Centre KISWIRE Sdn. BhdJohor Bahru Johor Malaysia Department of Materials and Mechanical Engineering Buein Zahra Technical University Qazvin *** Iran Department of Mechanical and Materials Engineering Masdar Institute of Science and TechnologyP. O. Box: 54224 Masdar City Abu Dhabi UAE Department of Mechanical Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal QCH3G 1MS Canada

Ternary Zn-0.5A1-0.5Mg and quatemary Zn-0.5A1-0.5Mg-xBi （x = 0.1, 0.3 and 0.5） alloys were studied to evaluate the thermal and structural characteristics, mechanical properties, cytotoxicity and in vitro degradation behavior. Thermal analysis and microstructural observations showed that Zn-0.5A1-0.5Mg is composed of FCC-A1 ＋ hCP- Zn ＋ Mg2（Zn,A1）ll while a new phase a-Mg3Bi2 appeared after the addition of Bi to the Zn-0.5A1-0.5Mg ternary alloy. The results revealed that the quaternary Zn-A1-Mg-Bi alloys have higher tensile strength, elongation and hardness but slightly lower corrosion resistance than those of the temary Zn-AI-Mg alloy. Based on the MTT assay, the Zn-A1-Mg and Zn-A1-Mg-Bi alloys were found to be biocompatible, and thus, they can be considered for further investigation in an in vivo environment.

关键词： Zn-AI-Mg-Bi Microstructure Mechanical property Corrosion Cytotoxicity

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Correlation of microstructural and corrosion characteristics of quaternary shape memory alloys Cu-Al-Ni-X(X=Mn or Ti)

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Transactions of Nonferrous Metals Society of China 2015年第4期25卷 1158-1170页

作者： S.N.SAUD E.hAMZAh T.ABUBAKAr h.r.bakhsheshi-rad Faculty of Mechanical Engineering Universiti Teknologi MalaysiaJohor Bahru 81310 Johor Malaysia

The effects of different contents(0.4%, 0.7%, and 1.0%, mass fraction) of Mn or Ti additions on the micro structure, shape memory effect and the corrosion behaviour of Cu-Al-Ni shape memory alloys were studied by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry and electrochemical and immersion tests in NaCl solution. It was observed that the microstructure, shape memory effect and corrosion characteristics are highly sensitive to the composition variations. It was found that the highest strain recovery was with 0.7% addition of Mn or Ti. This may be attributed to the presence of precipitation with a high volume fraction and the grain refinement. The electrochemical test showed that the formation of oxide layers in both Cu-Al-Ni-Mn and Cu-Al-Ni-Ti shape memory alloys(SMAs) provided good passivation which enhanced the corrosion resistance of the alloys. Immersion test showed that in Cu-Al-Ni-Mn SMAs, pitting corrosion occurred through feebleness in the oxide layer. A corrosion product adjacent to the pits was rich in Al/Mn oxide and depleted in Cu while inside of the pit it was rich in Cu. In Cu-Al-Ni-Ti SMAs, localized corrosion occurred on the surface of the specimens and dealuminization attack was also observed in the matrix.

关键词： Cu-Al-Ni alloy shape memory effect electrochemical test alloying addition microstructure

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Bioactivity,in-vitro corrosion behavior,and antibacterial activity of silver-zeolites doped hydroxyapatite coating on magnesium alloy

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Transactions of Nonferrous Metals Society of China 2018年第8期28卷 1553-1562页

作者： h.r.bakhsheshi-rad E.hAMZAh A.F.ISMAIL M.AZIZ E.KArAMIAN N.IQBAL Advanced Materials research Center Department of Materials EngineeringNajafabad Branch Islamic Azad University Department of Materials Manufacturing and Industrial EngineeringFaculty of Mechanical Engineering Universiti Teknologi Malaysia Advanced Membrane Technology research Center (AMTEC) Universiti Teknologi Malaysia Department of Biomedical Engineering University of Engineering and TechnologyLahore Pakistan

Mg-based alloys received significant attention for temporary implant applications while, their applications have been limited by high degradation rate. Therefore, silver-zeolite doped hydroxyapatite（Ag-Zeo-hAp） coating was synthesized on Ti O2-coated Mg alloy by physical vapour deposition（PVD） assisted electrodeposition technique to decrease the degradation rate of Mg alloy. X-ray diffraction（XrD） analysis and field emission scanning electron microscopy（FE-SEM） images showed the formation of a uniform and compact layer of Ag-Zeo-hAp with a thickness of 15 μm on the Ti O2 film with a thickness of 1 μm. The potentiodynamic polarization（PDP） and electrochemical impedance spectroscopy（EIS） tests indicated that corrosion resistance of Mg-Ca alloy was considerably increased by the Ag-Zeo-hAp coating. The bioactivity test in the simulated body fluid（SBF） solution showed that a dense and homogeneous bonelike apatite layer was formed on the Ag-Zeo-hAp surface after 14 d. Investigation of antibacterial activity via disk diffusion and spread plate methods showed that the Ag-Zeo-hAp coating had a significantly larger inhibition zone（3.86 mm） towards Escherichia coli（E. coli） compared with the Ti O2-coated Mg alloy（2.61 mm）. The Ag-Zeo-hAp coating showed high antibacterial performance, good bioactivity, and high corrosion resistance which make it a perfect coating material for biomedical applications.

关键词： magnesium alloy zeolite coatiilg bioactivity conosion behavior antibacterial activity

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Zinc-doped hydroxyapatite-zeolite/polycaprolactone composites coating on magnesium substrate for enhancing in-vitro corrosion and antibacterial performance

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Transactions of Nonferrous Metals Society of China 2020年第1期30卷 123-133页

作者： Nida IQBAL Saman IQBAL Tanveer IQBAL h.r.bakhsheshi-rad Ahmed ALSAKKAF Ahmad KAMIL Mohammed rafiq ABDUL KADIr Mohd hasbullah IDrIS h.Balaji rAGhAV Biomedical Engineering Centre University of Engineering and TechnologyKala Shah Kaku(KSK)CampusLahorePakistan Department of Physics University of the PunjabQuaid-e-Azam CampusLaborePakistan Department of Chemical Polymer&Composite Material Engineering University of Engineering and TechnologyKala Shah Kaku(KSK)New CampusLahorePakistan Advanced Materials research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran School of Mechanical Engineering Faculty of EngineeringUniversiti Teknologi MalaysiaJohorMalaysia Kulliyyah of Science International Islamic University MalaysiaBandar Indera Mahkota CampusJalan Sultan Ahmad Shah25200 KuantanPahang Darul MakmurMalaysia School of Biomedical Engineering and health Sciences Faculty of EngineeringUniversiti Teknologi MalaysiaJohorMalaysia Tissue Engineering Group(TEG) National Orthopaedic Centre of Excellence in Research and Learning(NOCERAL)Department of Orthopaedic SurgeryFaculty of MedicineUniversity of Malaya50603 Lembah PantaiKuala LumpurMalaysia

This work is focused on developing zinc-doped hydroxyapatite-zeolite(Zn hA-Zeo)and polycaprolactone(PCL)composite coatings on magnesium(Mg)substrate to improve the corrosion resistance and antimicrobial ***-coating technique was used to coat Zn hA-Zeo/PCL on the Mg substrate at room *** samples were subjected to field emission scanning electron microscopy(FESEM),X-ray diffraction(XrD),Fourier transform infrared(FTIr),energy dispersive X-ray spectroscopy(EDX)and antimicrobial *** demonstrated that composite coatings consist of hA,scholzite,zeolite,and PCL *** spectra indicated the presence of calcium(Ca),silicon(Si),aluminum(Al),zinc(Zn),phosphorus(P)and oxygen(O).The composite surface appeared in spherical-like microstructure on coating with thickness ranging 226-260μ***-doped hA-Zeo composite coating had a high corrosion resistance and provided sufficient protection to the Mg surface against galvanic *** Zn hA-Zeo coating samples exhibited superior disc inhibition by confirming antimicrobial activity against the *** as compared to hA-Zeo *** these results showed that the Zn hA-Zeo coatings not only improved the corrosion resistance,but also enhanced the antimicrobial property and hence they can be used as suitable candidates for implant applications.

关键词： biodegradable magnesium bioceramics coating corrosion resistance antimicrobial activity

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In-vitro degradation behavior of Mg alloy coated by fluorine doped hydroxyapatite and calcium deficient hydroxyapatite

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Transactions of Nonferrous Metals Society of China 2014年第8期24卷 2516-2528页

作者： h.r.bakhsheshi-rad E.hAMZAh M.DArOONPArVAr M.A.M.YAJID M.KASIrI-ASGArANI M.r.ABDUL-KADIr M.MEDrAJ Department of Materials Manufacturing and Industrial Engineering Faculty of Mechanical EngineeringUniversiti Teknologi Malaysia Materials Engineering Department Najafabad Branch Islamic Azad University Najafabad Isfahan Iran Department of Mechanical Engineering Concordia University 1455 De Maisonneuve Blvd.West Montreal QC H3G 1M8 Canada

Fluorine-doped hydroxyapatite(FhA) and calcium deficient hydroxyapatite(CDhA) were coated on the surface biodegradable magnesium alloy using electrochemical deposition(ED) technique. Coating characterization was investigated X-ray diffraction(XrD), Fourier-transformed infrared spectroscopy(FTIr), transmission electron microscopy(TEM), scanni electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS). The result shows that nano-FhA coated samp presents nano needle-like structure, which is oriented perpendicular to the surface of the substrate with denser and more unifo layers compared to the nano-CDhA coated sample. The nano-FhA coating shows smaller crystallite size(65 nm) compared to t nano-CDhA coating(95 nm); however, CDhA presents thicker layer(19 μm in thickness) compared to the nano-FhA(15 μm thickness). The corrosion behaviour determined by polarization, immersion and hydrogen evolution tests indicates that the nano-Fh and nano-CDhA coatings significantly decrease corrosion rate and induce passivation. The nano-FhA and nano-CDhA coatings c accelerate the formation of bone-like apatite layer and significantly decrease the dissolution rate as compared to the uncoated M alloy. The nano-FhA coating provides effective protection to Mg alloy and presents the highest corrosion resistance. Therefore, t nano-FhA coating on Mg alloy is suggested as a great candidate for orthopaedic applications.

关键词： magnesium alloy fluorine-doped hydroxyapatite calcium deficient hydroxyapatite electrodeposition corrosion behavior

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holographic dark energy in non-conserved gravity theory

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Communications in Theoretical Physics 2024年第4期76卷 126-133页

作者： h r Fazlollahi Institute of Gravitation and Cosmology Peoples Friendship University of Russia(RUDN University)6 Miklukho-Maklaya StMoscow117198Russia

recently, reconsidering the rastall idea T_(μ;νν)^(v)=α_(,μ) through relativistic thermodynamics gives a new form for the scalar field α which led us to construct modern modified theory of gravity debugged ‘non-conserved gravity theory’ Fazlollahi 2023 Euro. Phys. J. C 83 923. This theory unlike other modified theories of gravity cannot directly explain the current acceleration expansion in the absence of the cosmological constant and or existence of other forms of dark energy. hence, in this study we have reinvestigated holographic dark energy Ρ_(X)~h^(2) in the non-conserved theory of gravity. In this context, the density and pressure of dark energy depend on the non-conserved term and density of the dust matter field. As shown, due to non-conservation effects on large-scale structures, unlike the original holographic model, our model onsets an acceleration epoch for the current Universe satisfies observations. Moreover, the interaction and viscous scenarios are studied for this model.

关键词： non-conserved gravity covariant form of thermodynamics holographic dark energy

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Macroalgal deep genomics illuminate multiple paths to aquatic,photosynthetic multicellularity

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Molecular Plant 2024年第5期17卷 747-771页

作者： David r.Nelson Alexandra Mystikou Ashish Jaiswal Cecilia rad-Menendez Michael J.Preston Frederik De Boever Diana C.El Assal Sarah Daakour Michael W.Lomas Jean-Claude Twizere David h.Green William C.ratcliff Kourosh Salehi-Ashtiani Division of Science and Math New York University Abu DhabiAbu DhabiUAE Center for Genomics and Systems Biology(CGSB) New York University Abu DhabiAbu DhabiUAE Biotechnology research Center Technology Innovation InstitutePO Box 9639Masdar CityAbu DhabiUAE Culture Collection of Algae and Protozoa Scottish Association for Marine ScienceObanScotlandUK National Center for Marine Algae and Microbiota Bigelow Laboratory for Ocean SciencesEast BoothbayMEUSA Laboratory of Viral Interactomes GIGA InstituteUniversity of LiegeLiegeBelgium School of Biological Sciences Georgia Institute of TechnologyAtlantaGAUSA

Macroalgae are multicellular,aquatic autotrophs that play vital roles in global climate maintenance and have diverse applications in biotechnology and eco-engineering,which are directly linked to their multicellularity ***,their genomic diversity and the evolutionary mechanisms underlying multicellularity in these organisms remain *** this study,we sequenced 110 macroalgal genomes from diverse climates and phyla,and identified key genomic features that distinguish them from their microalgal *** for cell adhesion,extracellular matrix formation,cell polarity,transport,and cell differentiation distinguish macroalgae from microalgae across all three major phyla,constituting conserved and unique gene sets supporting multicellular *** genes show phylum-and climate-specific expansions that may facilitate niche ***,our study reveals genetic determinants of convergent and divergent evolutionary trajectories that have shaped morphological diversity in macroalgae and provides genome-wide frameworks to understand photosynthetic multicellular evolution in aquatic environments.

关键词： macroalgae multicellularity comparative genomics evolution adhesome endogenous viral elements

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Integralinput-to-statestability ystemswithsmalldelays Integral input-to-state stability of systems with small delays

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Control Theory and Technology 2024年第3期22卷 455-467页

作者： r.h.harsha Nawarathna Yuandan Lin Yuan Wang Department of Mathematical Sciences Florida Atlantic UniversityBoca RatonFL 33431USA

We consider how small delays affect the integral-input-to-state stability(iss)property for a *** result is similar to the input-to-state stability(Iss)result obtained in[1]:the iss property will be preserved in a practical and semi-global manner if the delay interval is small ***,since the iss quantifies the robust stability in terms of a generalized Li norm of the inputs instead of a generalized Loo norm of the inputs for the Iss case,the techniques and proofs for the Iss case do not apply to the iss case *** the proofs in[1]are based on the Lyapunov-razumikhin approach,our proofs are based on the iss-Lyapunov functions for the zero-delay *** addition to the interest by its own in showing how the iss property is affected by small delays,the result also serves to the study of the iss property for singularly perturbed systems.

关键词： Integral-input-to-state stability Nonlinear systems Small delays Lyapunov method

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